新一代高性能直流型光伏集成发电模块系统研究

Some challengeable academic problems have been solved for the high step-up, high efficiency and high output voltage applications by the National Natural Science Foundation for Young Scientists. 36 papers have been published or accepted for publication in various transactions, journals and peer-reviewed international conferences, including 17 high quality premier transaction papers. And 11 of them are published at IEEE Power Electron., which is the best transaction in Power Electronics. All these papers have been cited for 52 times by international researchers with very positive comments. Furthermore, a review paper on high step-up interleaved converters for PV grid-connected applications was invited and published at IEEE Transaction on Industrial Electronics due to the applicant’s clear contributions in this area. The innovative idea of this proposal comes from the National Natural Science Foundation for Young Scientists. This proposal mainly focuses on the next-generation DC-based PV integrated module system without any PV panels in direct parallel or series configurations. This proposed DC-based PV integrated module also performs high conversion efficiency, flexible configuration, high reliability. The major research contents are the follows: ① Topology generation law on single-phase high step-up converters for DC-based PV integrated module; ② Virtual mirrored DC bus voltage concept for PV transformer-less grid-connected inverters without any leakage current; ③ Flexible PV grid-connected structure with wide voltage and high efficiency conversion; ④ Systematical integration solution with MPPT control strategies, high step-up converters and PV panels. One of the clear potential benefits of the proposal is to make a clear picture on next-generation high performance and low cost PV grid-connected power generation configurations.

承担的青年基金项目解决了高增益高效率交错并联直流变换拓扑理论中若干关键问题，资助发表(含录用)SCI/EI论文36篇，SCI 论文17篇，电力电子国际最权威期刊(IEEE PE)论文 11篇，他引52次，应邀在电气工程国际权威期刊(IEEE IE)上发表高增益拓扑综述文章。本项目是青年基金科研内容的延续、深化和拓展，研究无需组件直接串-并联、效率优化、配置灵活、安全可靠的新一代直流型光伏集成模块系统，克服现有架构系统发电效率与单位发电成本难以兼顾的不足，包括①用于直流型光伏集成模块的长寿命、高增益和高效率变流拓扑形成规律；②镜像电压思想演绎无变压器并网逆变方法；③宽范围高效的柔性变拓扑并网结构；④MPPT策略、高增益电路和光伏组件的一体化集成。研究成果有望破解现有光伏系统投资大、周期长和回报慢等困局，大大推动光伏产业发展。同时为新能源领域中相关共性关键问题的解决提供理论和技术参考。

本项目的研究目标是研究无需组件直接串-并联的新一代直流型光伏集成模块架构，不仅可优化每个组件的发电效率，提高其安装灵活性；还能提高系统可靠性和安全性，克服现有光伏架构发电效率与系统成本难以兼顾的不足。重点研究内容包括：①适用于直流型光伏集成模块的高增益变流器拓扑，提高直流型光伏集成模块的系统效率和功率密度。②无变压器型并网逆变结构的形成方法，以实现系统的高效、安全和可靠运行。③单相光伏并未逆变器的虚拟矢量控制方法，以提高直流型光伏集成系统的稳态和动态响应。.本项目针对新一代高性能直流型光伏集成模块架构，通过嵌入内置变压器及倍压单元的电压增益拓展单元，提出了适用于直流型光伏集成模块的高增益变流器拓扑，提高了直流型光伏集成模块的系统效率和功率密度；分析了无变压器型并网逆变器的漏电流产生机理，提出了基于混合箝位思想的单相无变压器型光伏并网逆变器拓扑，抑制了功率器件的寄生振荡，更有效地消除了对地漏电流；建立了单相光伏逆变器的虚拟矢量控制统一模型，揭示了实轴和虚轴的交叉耦合项对系统稳定性的影响机理，并提出了基于滤波理论的系列优化控制算法，改善了系统的稳态和动态响应。相关研究成果表明，很好地完成了项目的既定研究目标。.在国家自然科学基金“青年-面上连续资助”项目支持下，本项目组成员经过四年来的持续努力和深入研究，已按计划完成了全部研究内容，实现了项目申请时拟定的预期目标。本自然科学基金项目已资助发表(含录用)SCI检索期刊论文11篇(IEEE国际期刊论文8篇)，EI检索国内期刊/国际会议论文9篇，取得了良好的学术成果。经此项目培养，申请人入选中组部“青年拔尖人才计划”(2015年)、科技部“中青年科技创新领军人才计划” (2014年)和浙江省杰出青年基金资助(批准号: LR16E070001)。